Advantage of N48 Black NdFeB Magnet block:high quality & intensity from 2~100 mm and available in disc,cylinder,block w/zn,Ni, The ... -240 Degrees;3. Customized Coating & Sizes AvailableSurface treatment: Ni, Zn, epoxy, gold, tin, Ni+Cu+Ni and Cr3+Zn;Size available ... OEM with own factory. Black Painted N35 NdFeB Magnet T-Block